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I have an Einhell BT-RH 1500 Rotary hammer drill. It has a pneumatic hammer action. Lately, the hammer action engages intermittently. Sometimes, it works, but most of the time it doesn't.
The problem appeared after I used it to break a 15 feet x 3 feet concrete slab about 4 inches thick. The tiny steel balls that hold the drill bit in place broke and the chisel bit would fall off repeatedly. I also wasn't aware that I needed to grease the drill bit before inserting it into the chuck. So the grease pretty much dried up at the end of my DIY.
Subsequently, I replaced the steel balls, cleaned up the part where the drill bit sits and re-applied the grease. Now the mechanism holding the drill bit in place works perfectly, but the hammer action is not engaging most of the time. I took the drill apart to see if I could locate the problem. When I couldn't, I just reassembled everything.
The only possibility that comes to mind is a broken O-ring, that could possibly be causing an air leak in the chamber in which the piston moves. I think the compressed air that is supposed to push the striker is escaping from the broken O-ring and not enough pressure is being generated to push the striker and make it hit the drill bit. I am going to replace the O-ring and see if it fixes the problem. The image below is an illustrated breakdown of the drill components. Part No 35 is the broken O-ring.
In the meantime, I would appreciate some feedback regarding this problem and look forward to some suggestions to fix it.
The problem appeared after I used it to break a 15 feet x 3 feet concrete slab about 4 inches thick. The tiny steel balls that hold the drill bit in place broke and the chisel bit would fall off repeatedly. I also wasn't aware that I needed to grease the drill bit before inserting it into the chuck. So the grease pretty much dried up at the end of my DIY.
Subsequently, I replaced the steel balls, cleaned up the part where the drill bit sits and re-applied the grease. Now the mechanism holding the drill bit in place works perfectly, but the hammer action is not engaging most of the time. I took the drill apart to see if I could locate the problem. When I couldn't, I just reassembled everything.
The only possibility that comes to mind is a broken O-ring, that could possibly be causing an air leak in the chamber in which the piston moves. I think the compressed air that is supposed to push the striker is escaping from the broken O-ring and not enough pressure is being generated to push the striker and make it hit the drill bit. I am going to replace the O-ring and see if it fixes the problem. The image below is an illustrated breakdown of the drill components. Part No 35 is the broken O-ring.
In the meantime, I would appreciate some feedback regarding this problem and look forward to some suggestions to fix it.
